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To see where the problem lies you could do an iperf test between two
instances of the same tenant running on the same compute node.

The traffic would still pass through openvswitch, but not across the Vxlan
tunnel.
On Oct 15, 2014 5:29 PM, "Sławek Kapłoński" <slawek at kaplonski.pl> wrote:

> Hello,
>
> I found also that when I capture traffic from tap interface and check it in
> wireshark then I see a lot of TCP DUP ACK packets before disconnection.
> Guys, really anyone has got similar problem with vxlan and windows guests?
> or
> anyone is using windows on such instances?
>
> ---
> Best regards
> Sławek Kapłoński
> slawek at kaplonski.pl
>
> Dnia wtorek, 14 października 2014 20:30:28 Sławek Kapłoński pisze:
> > Hello,
> >
> > I was trying with newest driver downloaded from
> > http://alt.fedoraproject.org/pub/alt/virtio-win/latest/images/
> > and also on older version.
> >
> > I did small test with two instances on one host. Then all traffic is
> going
> > only via br-int bridge in ovs (no any vxlan tunnel) and problem was the
> > same. But when I manually remove both tap interfeces from ovs and put it
> > into linux bridge than I not have this issue. So imho there is some
> problem
> > with openvswitch.
> > I'm using 1.11 version of opensvitch but yesterday I build from sources
> > version 2.3.0 and still is the same :/
> > I'm using kernel 3.13 on compute hosts.
> > Really anyone have got such issue with vxlan tunnels and windows guests?
> >
> > ---
> > Best regards
> > Sławek Kapłoński
> > slawek at kaplonski.pl
> >
> > Dnia wtorek, 14 października 2014 07:15:24 piszesz:
> > > Which virtio drivers are you using in your Windows guest?
> > >
> > > P
> > >
> > > On Oct 10, 2014 3:56 PM, "Sławek Kapłoński" <slawek at kaplonski.pl>
> wrote:
> > > > Hello,
> > > >
> > > > I have neutron with vxlan tenant networks. I'm using openvswitch to
> make
> > > > vxlan
> > > > tunnels.
> > > > Today I found strange problem with instances with Windows server
> > > > installed
> > > > on
> > > > guests. First problem is that tcp sessions (like RDP connection
> beetween
> > > > two
> > > > servers) in such tenant network are sometimes disconnected for a
> while
> > > > (like
> > > > packet loss in network). Second issue is that I have not good
> > > > performance
> > > > on
> > > > windows. My hosts have got 10Gbps network cards, I have set jumbo
> frames
> > > > (mtu=9000 on hosts) and if I set for example mtu=8950 on linux guests
> > > > than
> > > > I
> > > > have about 9Gbps when test with iperf. On windows I have about
> 2-2.5Gbps
> > > > with
> > > > mtu=1500 and even less with bigger mtu.
> > > > Do You maybe have such problems with windows guests using vxlan
> tunnels
> > > > network?
> > > > I'm testing it on Windows server 2012 R2.
> > > >
> > > > ---
> > > > Best regards
> > > > Sławek Kapłoński
> > > > slawek at kaplonski.pl
> > > > _______________________________________________
> > > > OpenStack-operators mailing list
> > > > OpenStack-operators at lists.openstack.org
> > > >
> http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack-operators
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